# $A 12 \;pF$ capacitor is connected to a $50\;V$ battery. How much electrostatic energy is stored in the capacitor?
$\begin{array}{1 1} 0.05 \times 10^{-8} \\ 2.5 \times 10^{-8}\\ 0.5 \times 10^{-8} \\ 1.5 \times 10^{-8}\end{array}$